The early morning bombing in Maidan Shahr, the main city of the province, some 35km (22) miles southwest of the capital Kabul, happened as policemen and civilians were going inside the base, said Hekmat Durrani, a spokesperson for the police chief.
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Three civilians and two policemen were among the dead, Durrani said, adding that the casualty figure could rise as policemen and first responders were busy recovering the wounded and bodies from collapsed walls and debris.
No group has claimed responsibility for Saturday’s attack but the Taliban militants fighting to overthrow the Western-backed Kabul government have carried out some of the deadliest bombings against government installations in past years.
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Strategically located along the route connecting Kabul to the southern region, Wardak is ideally placed for militants who control nearly mountain villages to use as a staging ground for suicide bombings inside Kabul.
The sprawling base built by the Americans, is home to hundreds of Afghan policemen from where they conduct operations in two nearby provinces.
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